| 摘要 |
PROBLEM TO BE SOLVED: To make small a groove gap of a butting groove of two pipes, and prevent the deterioration in sealing property. SOLUTION: A butting end part 86 of a existing pipe 53 is airtightly sealed by one side seal pushing ring 75 and one side first seal member 77, and a butting end 87 of a newly provided pipe 54 is airtightly sealed by other side seal pushing ring 76 and other side first sealing member 78. Like this, the existing pipe 53 and the newly provided pipe 54 are constituted so as to be respectively sealed individually, therefore the change of the sealing condition on the newly provided pipe side does not affect the sealing condition on the existing sealing condition of the existing pipe 53 side. Therefore, even when the newly provided pipe 54 is pushed to the existing pipe 53 side to bring the groove 62 into close contact, the sealing property is not lowered, and the satisfactory sealing condition can surely be held. |
